Per Starswirl the Bearded's theory of etheric mass transference, the amount of magic needed for a teleportation spell increased based on both the distance traveled and the amount of mass being moved. Thusly, if a unicorn had a maximum teleportation range of a mile (itself no small feat) then they could teleport themselves and a second pony roughly half of that distance.

Celestia's horn glowed, and in a flash of light, she transported herself, her sister, and the half-dozen prisoners directly into Princess Platinum's throne room. Such a naked display of magical power was almost enough to distract the shocked princess and her court from Celestia's naked display of, well, everything else. In fact, having teleported directly from the Efreet's lair, the entirety of the party was in the nude, save for Luna.

“Took care of your Efreet problem.” Celestia tossed the massive ruby onto the cushions in front of Princess Platinum.

The princess stared-- first at the gem, then up at the magical amazon who delivered it. The former made her eyes go wide, and the latter made her cheeks blush pink. “I ... ah ... thank you.” Princess Platinum finally tore her eyes away from Celestia's proudly bared breasts. “Dare I ask why you're ... indecent?”

“What, this?” Celestia looked down at herself. “I like to think I look more than 'decent.'” She winked saucily at the princess, then stretched her wings a little, framing herself like a painting. “But my tunic got burned off when the Efreet tried to light me on fire. You know how it goes.”

“No loss there, at least. Brown isn't your color, darling. Now then!” Princess Platinum clapped her hands. “Allow me to provide you all with proper attire-- 'tis the least I can do to show my appreciation for all you've done.”

“Honestly, you can spare the silk robes-- all I really want in return is a bottle of wine and some words with him.” Celestia looked over her shoulder at Clover the Clever, who raised a hand in an embarrassed wave, using the other to cover himself, with a mixed degree of success. “... and maybe a little more than conversation, if he's willing.” Celestia added on, smiling.

“Sister.” Luna cleared her throat, finally stepping forward.

“What? Monster-slaying gets me worked up. And he's cute.”

“I am?” Clover said, proving he wasn't clever in all subjects.

“My apologies for my sister's manners. Or lack thereof.” Luna said. “We have come a long way to speak with you, and we would prefer to do so as soon as possible.”

“Then sit. Speak.” Princess Platinum waved a slim, ring-adorned hand, and servants bustled up with plush cushions. “I'll have refreshments brought.”

“Thank you, Princess.” Luna bowed her head-- then nudged her sister, who did the same. Soon enough, the two alicorns and Clover had all sat down around Princess Platinum's dais. The rest of the rescued prisoners slipped off to recover elsewhere in the castle, leaving the odd quartet and a handful of stoic-faced servants the only ones in the throne room. Clover pulled a cushion over his lap, while Celestia settled into a languid sprawl, displaying herself-- Platinum and Clover both sneaking glances when they could.

“Starswirl told me about you, you know.” Clover said. “In his letters. He was always very proud of the both of you. Though honestly, just from the letters, I didn't expect you to be so ... impressive.”

Celestia winked at Clover. He blushed, and pressed the cushion a little tighter in his lap.

“So you've been exchanging letters with our teacher?” Luna leaned forward. “Did he say where he went? It's been years since--” She trailed off, voice hitching slightly with emotion.

“I know exactly what happened to Starswirl.” Clover said, grim. “He, along with several other brave ponies, sealed himself away to stop a great evil.”

“What?!” Celestia sputtered. “How? Why? I could have--”

Clover held up a hand, and Celestia (for once) stopped talking. “It was Starswirl's choice. He knew it was something he wouldn't come back from-- I imagine he didn't want you or your sister to risk it. He said the both of you had so much potential--”

“But he didn't say goodbye.” Celestia sniffled, an incongruously vulnerable gesture.

“There wasn't any time--” Clover began.

“That's enough.” Luna said, voice steely. “I thank you, Clover the Clever, for enlightening us. It's not how I expected this quest to end, but such is the way of things.” She shook her head.

“What will you do now?” Clover asked.

“They shall stay here as our honored guests.” Princess Platinum declared. “Until such time as Celestia and Luna decide what mad adventure they'll undertake next.” She reached out and gave Celestia's shoulder a gentle, reassuring squeeze.

Celestia smiled, and dabbed the tears from the corner of her eye. “Thank you, Princess.” She breathed in deeply, causing her generous bosom to rise and fall in quite the interesting manner. Celestia reached up and laid a hand over Platinum's. She met the princess' gaze for a few long, silent moments. And then, just as brazen as she'd been in her other adventures, she leaned in to give the alabaster unicorn a lengthy, hungry kiss.

“Oh!” Princess Platinum squeaked. She put a hand against her own chest, feeling her heart beat faster. “What ... what do you think you're doing?” she said.

“Needed to take my mind off of ... things.” Celestia ran her tongue over her lips. “That is, if you want to.”

“Who wouldn't?” Platinum blurted, and then blushed harder. “I mean, ah, you are aesthetically pleasing, not to mention quite uninhibited. It's enough to make you-- mmmph!” Platinum trailed off as Celestia kissed her again, this time reaching around the unicorn's waist to pull her into her lap.

“Um.” Clover the Clever stared, watching the most beautiful woman he'd ever met kiss the second most beautiful woman he'd ever met. Or perhaps third, if one took Luna into consideration. Clover blinked, finally wrenching his eyes away from Celestia and Princess Platinum-- only to find that Luna had silently disappeared, seemingly in the space between heartbeats. “I'll ... I'll leave you two be?”

“You don't have to.” Celestia said, even as she gently parted the silk of Platinum's robe, revealing her perfectly-shaped breasts. The amazon gave Platinum a squeeze, and the princess let out a delighted, wordless squeal.

Clover blushed. Stammered. “I- I couldn't.”

“I think you could.” Celestia's horn glowed, and a quick, telekinetic yank pulled the pillow out of his lap. Clover's large, dark-skinned cock bobbed upwards, the unicorn already hard from what he'd seen.

Princess Platinum fluttered her eyelashes at Clover. “Please?” she asked, perhaps the first time she'd made a request of him, and not an order. Whichever it was, Clover couldn't help but obey. He moved towards Celestia's pile of cushions, but by the time he was within arm's reach, the warrior-woman grabbed him around the thighs and pulled him into her lap alongside Platinum. It was crowded-- which was exactly the point. Body pressed against body as the trio entwined around each other. Lips, hands, even feathery wingtips traced over Clover and Platinum both. Clover could still smell a faint, smoky smell on Celestia, a reminder of her previous adventuring, more intoxicating than any perfume.

Celestia was by turns greedy and generous-- one moment, she'd press a lover to her chest, urging them to kiss and tease her achingly stiff nipples. The next, Celestia would gently toss Clover to his back, at which point she and Platinum eagerly ran their lips over his cock. Clover moaned and shuddered-- only for the women to suddenly stop.

“Not yet.” Celestia scolded him, playfully. She soon turned her attention to Princess Platinum, parting the unicorn's long legs to reveal the treasure of her pussy. Celestia wasted little time, rolling onto her belly, positioning herself so she could kiss and suckle at the princess' lower lips. Platinum gasped again and arced her back against the pile of cushions.

Celestia pulled away from between Platinum's legs long enough to look over her shoulder and wink at Clover. She didn't say anything-- she didn't have to, as the hiking of her flowing tail told everything Clover he needed to know. Acting on instinct, wondering if he was dreaming, Clover scooted up behind Celestia and positioned himself to enter her dripping folds.

“Do it.” Celestia huffed out.

Clover did.

He slid himself into the amazon, and gasped. Within, she was slick, tight, and most notably-- hot. Just short of painfully so, as Clover felt just the slightest brush of Celestia's inner heat and power. The warrior-woman moaned, laughed, and pushed her own hips back against Clover, hard enough to almost topple him. He grabbed hold of Celestia's round, perfect ass to steady himself, and the amazon gave another lusty moan. Clover braced himself, then started fucking Celestia properly, soon panting at the effort. The harder he went, the more Celestia enjoyed it-- though her moans were soon muffled as she eagerly lavished pleasure on Princess Platinum's royal pussy. The sovereign of all unicorns gasped and moaned, all of her royal poise melting away. She grabbed a handful of Celestia's hair, then cried out in ecstasy, shaking hard enough to make her tits wobble as she came.

Clover stared at the beautiful, unlikely sight of Platinum's climax-- and then gave a gasp of his own. Where Celestia was an invincible, insatiable demigoddess-- Clover certainly wasn't. Overwhelmed by the paradise of Celestia's pussy, it wasn't long before he reached his own peak, feeling his whole body tense before his cock started pumping his seed into Celestia's waiting sex. He bucked his hips a few more times, then collapsed against Celestia's back, nestling in between her wings.

“Mmm.” Celestia drew off of Platinum's still-sensitive folds, then sprawled out on the pile of silken cushions. She moved Clover and Platinum as if they weight no more than those same pillows, happily sandwiching herself between the two gasping, trembling unicorns. Celestia nearly purred in contentment, and idly twisted a lock of Platinum's purple hair around a finger.

“You know, Princess, I think I could get to like it here.”

Days later, Luna paced outside the throne room door. Her sister had seemingly taken up residence in there-- and the wanton cries heard day and night informed her exactly what she was up to. Every so often, one of the braver servants would slip in with food and refreshments-- only to emerge hours later, sweaty, sticky, and exhausted.

It would've been easy enough for Luna to kick the door in, but she knew the debauched bender was Celestia's way of distracting herself, of reminding herself that she was still alive. Celestia would tire of it ... eventually. Until then it was best to let things run their course, like letting a bonfire slowly burn itself down to charcoal and ashes. So long as nothing important came up, things would work themselves out. In time.

Naturally, that's when the ponies with swords showed up.

Luna perked her ears as she heard the jangle of harness tromping down the hallway. She turned-- and then found herself staring at a platoon of mixed ponies. Crest-helmed unicorn guards, lightly armored pegasus sky-knights, and even a handful of earth pony halberdiers.

“There you are!” The blue-coated pegasus at the head of the armed throng leveled an accusatory finger at Luna. Faintly, Luna matched the face to a painting she'd seen hanging elsewhere in the castle.

“Commander Hurricane, I presume?” Luna kept her hands away from her sword. For now.

“The one and only!” Commander Hurricane said. “Now, hand over your sword, and tell us what you did with Princess Platinum!”